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目 录1 英文文献翻译11.1Design Of A Lift11.2中文翻译112 专业阅读书目172.1 材料力学172.2 机械原理172.3 液压与气压传动172.4 机械制造装备设计172.5 工程材料172.6 现代工图学172.7 互换性与技术测量182.8 机械制造技术182.9理论力学183.0机械设计1811 英文文献翻译1.1Design Of A Lift Hydraulic lifting platform is a versatile crane lifting equipment, widely used in factories, docks, construction, transportation, sports, equipment maintenance and other high-altitude operations and maintenance. Existing hydraulic lifting platform there are many, can be roughly divided into: four-wheel mobile lifting platform, push-type lift platform, car load lifting platform, fixed platform lift, scissor lift platform, four-post lift The two column lift and so on.In recent years, with the rapid increase in the use of cars, Chinas booming auto industry, especially the car industry. This makes the auto repair industry has grown, demand for automotive maintenance equipment rapid expansion, but also the maintenance requirements in the automotive tools and equipment requirements on the increasingly high lift vehicle repair workshop is essential and most important maintenance machinery and equipment. The role of auto lift car is in need of repair, a smooth upgrade to the appropriate height, so that maintenance workers at the bottom of the car chassis maintenance and inspection. Generally divided into high column car lift and scissors. Either way, are required to meet the synchronous lifting the car, cornering can not happen, and asked for the empty chassis bottom for easy maintenance workers for maintenance work which requires lifting platform synchronous lifting, running smoothly. Therefore, maintenance of the car lifting platform equipment is generally driven by hydraulic system.With the expanding service sector, as well as the further development of automation, the maintenance staff to reduce labor intensity, making the easy maintenance, and can better improve the efficiency of vehicle maintenance, and car maintenance service quality, so the hydraulic lift Platform automation requirements are also rising. Vehicle maintenance is currently required to meet the synchronization control, lifting the platform lift system depends mainly on the hydraulic system and electrical control and drive systems, but the lift platform is currently owned by the widespread leakage, internal leakage, short life, the operation not flexible, synchronous operation and low defects. To avoid these disadvantages, require more precise synchronization to ensure that the hydraulic lifting platform lift precision, and now most of the hydraulic lifting platform simultaneously phasing out all traditional hydraulic valves, the use of more precise control of the new electro-hydraulic servo valve, electro-hydraulic proportional digital electro-hydraulic valve and valve to control the hydraulic system, to achieve synchronization and high precision. As a form of electro-hydraulic proportional valve type of diverse, easy to use composition of a variety of electrical and computer-controlled hydraulic system, control of high precision, installation flexibility and strong anti-pollution and many other advantages.Currently used in the automotive repair Hydraulic synchronous lift platform vehicle maintenance plays an important role in synchronous lifting platform on a variety of hydraulic valves, hydraulic cylinders, hydraulic pump station innovation and improvement, making a hydraulic lifting platform synchronization smooth running, low noise, fast response, high precision synchronization of the repair and maintenance in the car played a crucial role.With the hydraulic lift platform in the automotive repair industry, application and further improvement and innovation in the maintenance of hydraulic lifting platform has the car can achieve more complex functions, the structure of the platform, drive on, and a variety of control systems, has been greatly improved. The current lift platform lift system is mainly driven by the hydraulic system, of course, do not rely on hydraulic pressure, as well as dual-use diesel electric rotary lift platform, now appeared battery driven lift platform, continuously variable transmission can be achieved with safer, more convenient and low noise advantages. Lifting platform is currently widespread leakage, internal leakage, short life, the operation is not flexible, synchronous operation and low defects. To avoid these disadvantages, require more precise synchronization to ensure that the hydraulic lifting platform lift precision, and now most of the hydraulic lifting platform simultaneously phasing out all traditional hydraulic valves, the use of more precise control of the new electro-hydraulic servo valve, electro-hydraulic proportional digital electro-hydraulic valve and valve to control the hydraulic system, to achieve synchronization and high precision. As a form of electro-hydraulic proportional valve type of diverse, easy to use composition of a variety of electrical and computer-controlled hydraulic system, control of high precision, installation flexibility and strong anti-pollution and many other advantages, applications become increasingly broadened.In China, although synchronous hydraulic lifting platform for such development, production started late, but with Chinas rapid economic development, in order to adapt to China in various fields used by the synchronous hydraulic lifting platform development needs and take the large-scale, standardized , intensive, product support services, achieving mechanical, electrical, fluid integration platform in the application of synchronous movements. The use of synchronous hydraulic lifting platform surface, the service has been expanding, is now in rapid development stage, and now hydraulic lifting platform reliability, security, easy operation and simple directness, and other aspects greatly improved, and with the the popularity and development of computer and mechanical, electrical, fluid integration progress of the study, major domestic and foreign companies have to compete with the computer (electronic) control system to improve overall performance and reduce the use of hydraulic components, machine, reducing the whole size and weight, improve the sensitivity of control and synchronization accuracy. In particular, the manufacturers actively introducing and digesting foreign advanced technology, development of new varieties, improving product technology and quality level, has been part of the hydraulic lifting platform synchronized at or close to the international level of similar products.Currently used in the automotive repair Hydraulic synchronous lift platform vehicle maintenance plays an important role in synchronous lifting platform on a variety of hydraulic valves, hydraulic cylinders, hydraulic pump station innovation and improvement, making a hydraulic lifting platform synchronization Smooth running, low noise, fast response, high precision synchronization, for the repair and maintenance of the car plays an irreplaceable role in a wide range prospects. Therefore, the lifting platform for further research and improvement, optimize system performance and structure to further improve to make up for the shortcomings of existing technology has important significance.The subject of the design of the hydraulic lifting platform main use of theoretical research and design, through the understanding and study of the hydraulic system, as well as existing control technologies and more in-depth research and development, in the hydraulic system components and further understanding and learning , Combined with the modernization of hydraulic components and automation and control components within the hydraulic control through traditional high-tech components and control elements of existing comparative and comprehensive application of the traditional hydraulic system, based on the research and design more innovative set of machines , Electricity, liquid in one of the hydraulic control system, makes the system more stable and faster to achieve the advantages.Hydraulic lift platform system, requires the ability to achieve four-wheeled vehicles in a controlled synchronous lifting height lifting range, to achieve safe and reliable control of the two front, two rear, two revolvers, two rounds of synchronous lifting the right and to ensure synchronous movements accuracy. The hydraulic lift system also must have a fast response speed, hydraulic power units, small size, compact structure, large power weight ratio, ease of manipulation and control, labor-saving convenience and easy to implement automated, with overload protection for high reliability requirements system, excellent technical performance, while ensuring synchronous hydraulic lifting platform can be anywhere in the vertical direction on a longer time (60 min or longer) within a reliable locking, the system can work continuously and reliably, the system energy efficient, easy to maintain low cost. Hydraulic lift platform to meet system design requirements, synchronous movements smooth, and the design to achieve the functional requirements, develop the system closed-loop control of hydraulic systems, hydraulic systems used to satisfy the synchronization requirements of precision and control to achieve the four-wheeled vehicles in a controlled synchronous lifting height lifting range, to achieve safe and reliable control of the two front, two rear, two revolvers, two rounds of synchronous lifting the right and to ensure the accuracy of synchronous movements.To meet the synchronous lifting hydraulic system, the system needs to have synchronization control device to achieve synchronization. Synchronization of hydraulic system is currently running multiple control methods, mainly mechanical synchronization method, pump or motor parallel method, double rod cylinder in series, control valve, synchronizer, synchronization control valve circuit, servo and so on.According to the design of machinery and equipment requirements for the realization of a better two-car front-wheel, two rear, two revolvers, two synchronous lifting the right wheel, respectively, the flexible control, the design of the four hydraulic cylinders used for its intended to achieve their respective parts of the wheel lift and flexible control. Synchronization to achieve higher accuracy and more flexible control, the design does not use the traditional control valves to control, but intends to adopt more new electro-hydraulic proportional control valve to control. Electro-hydraulic proportional control valve is between the ordinary hydraulic valve and servo valve between a fluid control valves, servo valves with similar functions, but also has its specific advantages. Proportional solenoid valve is replaced by the proportion of ordinary hydraulic valve adjustment and control devices and form, it can be given input voltage or current signal proportional continuous, remote control of the direction of flow, pressure and flow. Reasonable use of electro-hydraulic proportional control valve can improve the automation and accuracy, and simplify the system. Commonly used proportional valve can be divided into: proportional pressure valve, proportional flow valves and proportional directional valve three.The design uses electro-hydraulic proportional control system, closed-loop feedback control system, the detection by the sensor and fed back through the electro-hydraulic proportional plc valve, electro-hydraulic proportional control valve opening size corresponding to the achievement of the hydraulic cylinder to achieve synchronous lifting control accuracy. To ensure the hydraulic cylinder to achieve at work to ensure self-locking, hydraulic system should be in each cylinder fuel supply system with check valve to achieve self-lock function to ensure the safety of hydraulic lifting platform. Overload protection to ensure the realization of the hydraulic system, hydraulic system relief valve in the hydraulic pump that needs to be installed to ensure the safety of the system to provide a certain pressure. Oil to the system to meet the system requirements to run and quality of hydraulic oil, hydraulic system should be in the inlet and outlet port to install filters. In order to meet the hydraulic system can be fully automated, the system of hydraulic directional control valve solenoid valve are used. In order to better respond to energy problems, you can, where necessary, instead of using the accumulator motor-driven pump provides the pressure accumulator to provide the direct use of the hydraulic cylinder pressure to meet the relevant sport.In order to achieve self-locking hydraulic cylinder to the function of the hydraulic system in the bottom of each cylinder are equipped with check valve, check valve can achieve one-way self-locking, two-way communication function of the oil. In order to provide security to meet the hydraulic system pressure, not suddenly as high pressure hydraulic system of the adverse effects or even damage some of the hydraulic components, so as a safety valve with pressure relief valve to prevent hydraulic overload protection. In order to achieve automation of the hydraulic system to meet the simultaneous operation of the system is more accurate, and the realization of the systems high efficiency, rapid response requirements, the use of electro-hydraulic proportional directional control valve to high precision, fast response to the synchronization control. Most of the traditional manual control valve, which controlled comparison machinery, it is difficult to achieve automation. Electromagnetic valve, use the pull solenoid valve to control the direction of control of the commutation circuit to achieve better automated results. Shunt valve assembly, also known as synchronous valve, is a hydraulic diversion valve, valve functions in one set of the independent hydraulic device. Shunt valve synchronization is the set speed sync, that is, when two or more cylinders cylinder under different loads, respectively, the shunt valve set pressure and flow through the sensitive internal components automatically adjust the fuel tank of exercise to maintain synchronization. Shunt valve assembly is mainly used in multi-cylinder hydraulic cylinder and the synchronization control system. Split set by the synchronous control flow valve hydraulic system has a simple structure, low cost, design, sets, debugging and ease of use, reliability and many other advantages, which shunt valve assembly in the hydraulic system has been widely used, so there will also be a reasonable set of flow diversion valve used to achieve simultaneous control of two hydraulic cylinders. In the hydraulic system, the oil cleanliness of the normal operation of the hydraulic system has a vital role, so the oil pump and fuel tank return port port filters have been installed in order to ensure that the cleaning fluid degrees, which is an indispensable circuit hydraulic system attachment.In this system, due to the beneficial effects of gravity, the decline in the course of lifting platform, you can completely rely on gravity to provide power, where only one-way valve on the hydraulic control valve port for remote control of the pressure to provide, in under the action of gravity to allow check valve can be decreased to achieve oil return channel, as the pressure is not big, so no need to re-use of oil pump drive motors to achieve the check valve through the oil pressure can be used directly to provide the pressure accumulator, so the treatment, not only simplifies the system control, and can better save energy and avoid frequent start the motor, can effectively extend the life of the motor and pump, and to improve the efficient use of the hydraulic system, which can be said that the biggest advantage of the system design.Hydraulic platform of exercise is to achieve the various hydraulic cylinders rise and fall, but the rise and fall during the lifting phase will be a period in the acceleration of movement, until the required speed to the speed, the platform will achieve a uniform motion and then decelerate to stop. Throughout the campaign process, the hydraulic lifting platform mainly by the external load platform of the cars own weight of gravity and composition. Therefore, the size of the external load is relatively stable and unchanging, and only in the acceleration phase of operation of the entire platform will have a maximum load.Hydraulic lifting platform synchronized variety of mechanical structure, a four-wheel mobile lifting platform, elevating platform vehicle-mounted, fixed landing platform, sets of cylinder-type lift platform, four-column lifting platform, the two-column lifting platform, scissor Lifting platform, and other mechanical structure, and mechanical structure of different ways to achieve different movements to meet the different, specific ways of working and working environment.The design of synchronous hydraulic lifting platform is designed to meet the car repair industry in the use of lifting platform. Maintenance workers to consider maintenance when the car convenient and comfortable, you need to lift the car a certain height, but such use conditions, most of the requirements of hydraulic lifting platform is fixed, so the fixed hydraulic lift platform. While the four cylinder design can be fixed in the foundation, and to consider their own characteristics and the hydraulic cylinder the height, you can dig a pit in the maintenance shop type of foundation, the four cylinder bolts to fully firmly fixed to the ground by on. In order to be able to check and repair chassis, hydraulic lifting platform not designed for the whole plate fixed on the hydraulic cylinder in the bottom four shelves, is thoughtful, I designed the mechanical structure to meet the four-wheel placed in the middle hollow of the platform structure, so that not only meet the maintenance requirements, but also save a portion of material, making the structure more simple and beautiful. Taking into account the car body as a whole if there is a need to use floating platform from the condition, for example, remove the wheels need repair or need to dress up tires, etc., are required to meet all hold up the whole body, this, this design in each set of two plates of another set of lifting devices, lifting devices to facilitate use of the vehicle chassis will hold up, to achieve overall body vacant. To consider the overall open on the car platform, hold up the car fixed and plate lifting devices, and can be used scissor lift to reach the level of a structure. The biggest advantage of using this structure is not hold up in the chassis to the plate when retracted within this structure, so that the overall structure is beautiful and practical. To meet the car on the platform do not slip and stable place on the platform, placed on the plate anti-slip skid plate.Programmable Logic Controller (PLC) is an industrial control computer, is the succession of computer, automatic control technology and communication technology as one of the new automatic device. It has strong anti-interference ability, low price, reliability, programming is simple, easy to use and so on, in the industrial field operators by the likes of engineering, so PLC in all areas of industrial control is widely used.The design is based on the ratio of the hydraulic cylinder piston rod valve position control system, namely the use of PLC control signal generated by electro-hydraulic proportional valve driver to control the exact location of the hydraulic cylinder. Hydraulic cylinder piston rod displacement sensor displacement feedback signal output by the A / D converted into digital signals into the computer, the PLC signals within a given comparison, and the control algorithm according to the set after the output control signal, after D / A converted to analog voltage or current signal proportional electro-hydraulic control valve spool position to control the flow of the hydraulic cylinder transmission, drive hydraulic cylinder itute a closed-loop control for precise positioning .1.2中文翻译 液压升降平台是一种多功能起重升降设备，广泛应用于工厂、码头、建筑、交通、体育馆、设备检修等高空作业及维修。现有的液压升降平台有很多种，大体可分为：四轮移动式升降平台、手推式升降平台、汽车装载式升降平台、固定式升降平台、剪叉式升降平台，四柱举升机，两柱举升机等等。近年来，随着汽车的使用量迅速增加，我国汽车业蓬勃发展，尤其是轿车行业。这使得汽车维修行业的不断壮大，汽车维修设备的需求迅速扩大，同时也要求在汽车的维修工具和设备的要求上越来越高，汽车举升机是维修厂必备的，也是最重要的维修机械设备。汽车举升机的作用是将需要维修的汽车，平稳提升到合适的高度，以便于维修工人在汽车底盘下方对汽车进行维修和检查。汽车举升机一般分为立柱式和剪叉式。无论哪一种，都要求可以满足将汽车同步升降，不可以发生侧偏，并且要求汽车底盘下方为空的，用以方便维修工人进行维修作业这就要求升降平台同步升降，平稳运行。所以维修汽车的升降平台设备一般采用液压系统进行驱动。随着维修行业的不断扩大，以及自动化水平的进一步发展，为减轻维修人员的劳动强度，使得方便维修，并且能够更好的提高汽车维修的工作效率，以及汽车维修的服务质量，所以对液压升降平台的自动化要求也在不断提高。当前为满足汽车维修所要求的同步控制，升降平台的升降系统主要是靠液压系统以及电气系统进行控制和驱动的，但目前所拥有的升降平台普遍存在着外漏、内漏、寿命短、操作不灵活、同步运行低等缺点。为了避免以上缺点，要求更加精确地保证液压升降平台的同步升降精度，现在大多数液压同步升降平台逐步淘汰了各种传统的液压阀，采用更为精确控制的新型电液伺服阀、电液比例阀以及电液数字阀等来控制液压系统，实现同步精度高。由于电液比例阀具有形式种类多样、容易组成使用电气及计算机控制的各种机电液系统、控制精度高、安装使用灵活以及抗污染能力强等多方面优点，因此应用领域日益拓宽。当前在汽车维修中所使用的液压同步升降平台在汽车的维修方面发挥着重要的作用，通过对同步升降平台的各种液压阀、液压缸、液压泵站的创新改进，使得液压同步升降平台拥有运行平稳、噪声低、响应速度快、同步精度高等优点，对在汽车的维修与保养中起到至关重要的作用。随着液压升降平台在汽车维修行业的进一步应用和改进创新，在维修汽车的液压升降平台已经可以实现更多更复杂的功能，在平台的结构上，驱动上，以及各种的控制系统上，都有了很大的改进。当前升降平台的升降系统主要是靠液压系统驱动的，当然不光靠液压，还有柴油机电动两用旋转式升降平台，目前又出现了电瓶驱动升降平台，可以实现无级变速具有更安全、更方便、低噪音等优点。目前升降平台普遍存在着外漏、内漏、寿命短、操作不灵活、同步运行低等缺点。为了避免以上缺点，要求更加精确地保证液压升降平台的同步升降精度，现在大多数液压同步升降平台逐步淘汰了各种传统的液压阀，采用更为精确控制的新型电液伺服阀、电液比例阀以及电液数字阀等来控制液压系统，实现同步精度高。由于电液比例阀具有形式种类多样、容易组成使用电气及计算机控制的各种机电液系统、控制精度高、安装使用灵活以及抗污染能力强等多方面优点，因此应用领域日益拓宽。在我国，虽然对这种液压升降同步平台的研制、生产起步较晚，但是随着我国经济的快速发展，为了适应我国在各领域所使用的液压升降同步平台发展的需求，走规模化、标准化、集约化、产品配套化、实现机、电、液一体化技术在升降同步平台上的应用。液压升降同步平台的使用面、服务领域不断扩大，现正处于较快的发展阶段，现在液压升降平台的可靠性、安全性、操作方便和简单的直接性等方面都有较大提高，而且随着电子计算机的普及和发展以及机、电、液一体化研究的进展，国内外各大公司竞相采用电脑(电子)操控系统，提高整机性能，减少整机液压元件的使用，减小整机体积及重量，提高操控的灵敏度以及同步精度。特别是各生产厂家积极引进和消化国外先进技术，开发新品种，提高产品技术和质量水平，液压升降同步平台已有部分达到或接近国际同类产品的水平。当前在汽车维修中所使用的液压同步升降平台在汽车的维修方面发挥着重要的作用，通过对同步升降平台的各种液压阀、液压缸、液压泵站的创新改进，使得液压同步升降平台拥有运行平稳、噪声低、响应速度快、同步精度高等优点，对于在我国汽车的维修与保养中起着不可替代的作用，应用前景广泛。所以，对该升降平台的进一步研究和改进，优化系统性能和结构的进一步改善，弥补现有技术的缺点有着重要的意义。该课题对液压升降平台的设计主要采用理论的研究和设计方法，通过对液压系统的了解和研究，以及对现有控制的技术和更加深入的研究发展，在对液压系统元件和进一步了解和学习，结合液压元件与现代化的自动化控制领域内的液压控制元件，通过传统元件和现有的高技术控制元件的对比和综合应用，在传统液压系统的基础上，更为创新的研究和设计集机、电、液于一体的液压控制系统，使得系统达到更为稳定和快速优点。液压升降平台的系统，要求能够实现四轮汽车在受控高度升降范围内同步升降，安全可靠地控制实现两前轮、两后轮、两左轮、两右轮的同步升降，并保证同步升降的精度。该液压升降系统还必须具有快的响应速度，液压传动装置体积小、结构紧凑，具有较大的功率质量比，易于操纵与控制，省力方便，易于实现自动化，具有过载保护对于可靠性要求高的系统等优良的技术性能，同时保证液压升降同步平台能在垂直方向的任意位置上较长时间 (如60 min或更长) 内可靠地锁定，系统能连续可靠地工作，系统高效节能、维护方便、造价低。为满足液压升降平台的系统设计要求，实现平稳的同步升降，以及设计所要达到的功能要求，拟定该系统采用液压系统的闭环控制，用来满足液压系统的同步精度和控制要求，用以实现使四轮汽车在受控高度升降范围内同步升降，安全可靠地控制实现两前轮、两后轮、两左轮、两右轮的同步升降，并保证同步升降的精度。为满足液压系统的同步升降，该系统需要具有同步控制的装置来实现同步控制。目前实现液压系统的同步运行有佷多种控制方法，主要采用机械同步法、泵或马达并联法、双活塞杆缸串联法、调速阀、同步器、同步控制阀回路、伺服机构等等。根据该设计的机械设备要求，为更好的实现汽车四轮的两前轮、两后轮、两左轮、两右轮的分别同步升降的灵活控制，此次设计拟采用四个液压缸对其进行各轮的部位实现各自灵活的升降控制。为实现更高的同步精度和更加灵活的控制，设计并没有采用传统的控制阀进行控制，而是拟采用更加新型的电液比例控制阀来进行控制。电液比例控制阀是介于普通液压阀和电液伺服阀之间的一种液压控制阀，并与电液伺服阀的功能相似，而且具有它特定的优点。电液比例阀是由比例电磁铁取代普通液压阀的调节和控制装置而构成的，它可以按给定的输入电压或电流信号连续地按比例、远距离地控制流体的方向、压力和流量。合理的采用电液比例控制阀可以提高系统的自动化程度和精度，并简化了系统。常用的比例阀可分为：比例压力阀、比例流量阀和比例方向阀三种。本次设计采用电液比例控制系统的闭环反馈控制系统，通过传感器的检测，并通过plc反馈给电液比例阀，控制电液比例阀的相应开口大小，用以实现各液压缸能够实现同步升降的控制精度。为实现能够保证液压缸在工作时保证自锁，液压系统应该在每个液压缸的供油系统采用液控单向阀进行自锁功能的实现，用以保证液压升降平台的安全问题。为保证液压系统实现过载保护，液压系统在液压泵处需要安装溢流阀，来保证给系统提供一定的安全压力。为了系统的油液满足系统运行的液压油的要求和质量，液压系统应该在进油口和出油口处安装过滤器。为了满足液压系统能够充分的实现自动化，系统中的液压方向阀均采用电磁换向阀。为了更好的响应节能问题，可以在必要的情况使用蓄能器来代替电机驱动泵所提供的压力，直接使用蓄能器来提供压力满足液压缸的相关运动。为了使液压缸可以实现自锁的功能，液压系统中在每个液压缸下端都安装了液控单向阀，液控单向阀可以实现单向自锁，双向通油液的功能。为了使液压系统中满足提供安全压力，不致由于压力突然变高而对整个液压系统造成不利影响甚至损坏某些液压元件，所以采用溢流阀来用作安全阀防止液压系统过载的保护。为了实现液压系统自动化，满足系统同步运行的更高精度，以及实现系统的高效率、快速响应的要求，采用电液比例方向阀来高精度、响应快的进行系统的同步控制。传统的换向阀大部分是手动控制，这种控制比较机械，难以实现自动化操作。采用电磁换向阀，利用电磁铁的吸合来控制阀的方向控制，实现油路的换向，更好的实现了自动化的效果。分流集流阀也称同步阀，是集液压分流阀、集流阀功能于一体的独立液压器件。分流集流阀的同步是速度同步，即当两油缸或多个油缸分别承受不同的负载时，分流集流阀通过内部的压力和流量敏感部件自动调节，使油缸运动保持同步。分流集流阀主要应用于液压双缸及多缸同步控制系统中。采用分流集流阀的同步控制液压系统具有结构简单、成本低、设计、成套、调试和使用容易、可靠性强等许多优点，因而分流集流阀在液压系统中得到了广泛的应用，所以在该处也将合理的采用分流集流阀来实现两个液压缸的同步控制。在液压系统中，油液的清洁度对液压系统的正常运行有着至关重要的作用，所以在泵的出油口和油箱的回油口都安装了过滤器，以此来保证油液的清洁度，这是液压系统回路中不可缺少的附件。在该系统中，由于重力的有利影响，在升降平台下降的过程中，可以完全依靠重力的作用来提供动力，在这里只需要对